The alpha emission process results in the daughter nucleus differing in what manner from the parent?
a. Atomic mass decreases by two.
b. Atomic number increases by one.
c. Atomic mass increases by one.
d. Atomic number decreases by two.
D
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Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
A) because when elements split in a fission reaction, they prefer to split with all the protons paired B) because elements are mainly made in fusion reactions with hydrogen nuclei C) because elements are mainly made in fusion reactions with helium nuclei D) There's no explanation; it's something of a mystery to be explained or it may be a coincidence.
Which of the following would not have significant effect on the probability distribution of position of an electron (in a given combination of quantum numbers) in the hydrogen atom?
Five gas molecules are found to have speeds of 100, 200, 300, 400, and 500 m/s. The rms speed (in m/s) is
a. 390. b. 300. c. 360. d. 330. e. 320.
For a given steel, there is a crack of length a in the steel, and the yield strength of the steel is increased by heat treatment. The fracture strength of this steel is _________.
Fill in the blank(s) with the appropriate word(s).